Note 7 - Investments and Fair Value of Financial Instruments - Valuation of Securities (Details) - USD ($)	Sep. 30, 2018	Jun. 30, 2018
Investments	$ 3,110,943	$ 3,204,005
Fair Value, Inputs, Level 1 [Member]
Investments	2,783,627	2,961,666
Fair Value, Inputs, Level 2 [Member]
Investments	327,316	242,339
Fair Value, Inputs, Level 3 [Member]
Investments
Money Market Funds [Member]
Investments	80,272	180,138
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Investments	80,272	180,138
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Investments
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Investments
Mutual Fund [Member]
Investments	2,702,440	2,780,480
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Investments	2,702,440	2,780,480
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Investments
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Investments
Hedge Asset [Member]
Investments	327,316	242,339
Hedge Asset [Member] | Fair Value, Inputs, Level 1 [Member]
Investments
Hedge Asset [Member] | Fair Value, Inputs, Level 2 [Member]
Investments	327,316	242,339
Hedge Asset [Member] | Fair Value, Inputs, Level 3 [Member]
Investments
Other Equities [Member]
Investments	915	1,048
Other Equities [Member] | Fair Value, Inputs, Level 1 [Member]
Investments	915	1,048
Other Equities [Member] | Fair Value, Inputs, Level 2 [Member]
Investments
Other Equities [Member] | Fair Value, Inputs, Level 3 [Member]
Investments